The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

Question

Which change of state is taking place?

gas to solid
gas to liquid
liquid to solid
solid to liquid

Answer 1

The change of state taking place is liquid to solid. This is because the atoms in the sample are close together and can slide past one another, characteristic of a liquid. As they lose energy and move slower, they eventually become locked in place due to the attractive forces between them, forming a solid.